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## org.bouncycastle.asn1.x509
Class KeyUsage

    java.lang.Object
      org.bouncycastle.asn1.ASN1Object
          org.bouncycastle.asn1.x509.KeyUsage

All Implemented Interfaces:
  ASN1Encodable, Encodable

public class KeyUsage
extends ASN1Object

The KeyUsage object. id-ce-keyUsage OBJECT IDENTIFIER ::= { id-ce 15 } KeyUsage ::= BIT STRING { digitalSignature (0), nonRepudiation (1), keyEncipherment (2), dataEncipherment (3), keyAgreement (4), keyCertSign (5), cRLSign (6), encipherOnly (7), decipherOnly (8) }

Field Summary
`static int` | `cRLSign`
`static int` | `dataEncipherment`
`static int` | `decipherOnly`
`static int` | `digitalSignature`
`static int` | `encipherOnly`
`static int` | `keyAgreement`
`static int` | `keyCertSign`
`static int` | `keyEncipherment`
`static int` | `nonRepudiation`

Constructor Summary
`KeyUsage(int usage)` Basic constructor.

Method Summary
`static KeyUsage` | `fromExtensions(Extensions extensions)`
`byte[]` | `getBytes()`
`static KeyUsage` | `getInstance(java.lang.Object obj)`
`int` | `getPadBits()`
`boolean` | `hasUsages(int usages)` Return true if a given usage bit is set, false otherwise.
`ASN1Primitive` | `toASN1Primitive()` Method providing a primitive representation of this object suitable for encoding.
`java.lang.String` | `toString()`

Methods inherited from class org.bouncycastle.asn1.ASN1Object
`encodeTo, encodeTo, equals, getEncoded, getEncoded, hasEncodedTagValue, hashCode`

Methods inherited from class java.lang.Object
`clone, finalize, getClass, notify, notifyAll, wait, wait, wait`

Field Detail

### digitalSignature

    public static final int digitalSignature

See Also:
  Constant Field Values

### nonRepudiation

    public static final int nonRepudiation

See Also:
  Constant Field Values

### keyEncipherment

    public static final int keyEncipherment

See Also:
  Constant Field Values

### dataEncipherment

    public static final int dataEncipherment

See Also:
  Constant Field Values

### keyAgreement

    public static final int keyAgreement

See Also:
  Constant Field Values

### keyCertSign

    public static final int keyCertSign

See Also:
  Constant Field Values

### cRLSign

    public static final int cRLSign

See Also:
  Constant Field Values

### encipherOnly

    public static final int encipherOnly

See Also:
  Constant Field Values

### decipherOnly

    public static final int decipherOnly

See Also:
  Constant Field Values

Constructor Detail

### KeyUsage

    public KeyUsage(int usage)

  Basic constructor.

Parameters:
  `usage` - - the bitwise OR of the Key Usage flags giving the allowed uses for the key. e.g. (KeyUsage.keyEncipherment | KeyUsage.dataEncipherment)

Method Detail

### getInstance

    public static KeyUsage getInstance(java.lang.Object obj)

### fromExtensions

    public static KeyUsage fromExtensions(Extensions extensions)

### hasUsages

    public boolean hasUsages(int usages)

  Return true if a given usage bit is set, false otherwise.

  Parameters:
    `usages` - combination of usage flags.
  Returns:
    true if all bits are set, false otherwise.

### getBytes

    public byte[] getBytes()

### getPadBits

    public int getPadBits()

### toString

    public java.lang.String toString()

### toASN1Primitive

    public ASN1Primitive toASN1Primitive()

  Description copied from class: `ASN1Object`
  Method providing a primitive representation of this object suitable for encoding.

  Specified by:
    `toASN1Primitive` in interface `ASN1Encodable`
  Specified by:
    `toASN1Primitive` in class `ASN1Object`
  Returns:
    a primitive representation of this object.

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